Entropy and area.

  title={Entropy and area.},
  journal={Physical review letters},
  volume={71 5},
  • Srednicki
  • Published 9 March 1993
  • Physics
  • Physical review letters
The ground-state density matrix for a massless free field is traced over the degrees of freedom residing inside an imaginary sphere; the resulting entropy is shown to be proportional to the area (and not the volume) of the sphere. Possible connections with the physics of black holes are discussed. 

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